MeanWell UL Indoor Power Supplies

It's simple math, but it's the step people get wrong most often. First, calculate the total wattage of your LED strip run (that's length in feet multiplied by the watts-per-foot from the strip's spec sheet). Then, add a 20% safety margin by multiplying that total by 1.2. So if your strips add up to 80 watts, you need a power supply that's at least 96W. Don't run a driver at 100% of its rated load; it'll run hot and fail early. Our guide on calculating LED power needs walks you through it.

These indoor MeanWell units have screw-down terminals for a hardwired connection. You'll connect your building's AC mains power (Line, Neutral, and Ground) to the input terminals. Then, connect the wires from your LED strip to the DC output terminals, marked V+ and V-. Be careful with polarity: the red wire from the strip almost always goes to V+, and black to V-. Get it backward and the strip just won't light up. Our guide on how to connect a power supply has diagrams for every common setup.

It's all about the enclosure and waterproofing. These indoor models use a perforated metal case that's designed for air circulation in a dry, protected space like a cabinet or utility room. Our different MeanWell UL outdoor power supplies are fully sealed, usually with an IP67 rating, to protect the electronics from rain, dust, and moisture. Don't ever use an indoor unit outside, even if it seems sheltered. It will fail.

To fight voltage drop on very long runs. With a 24V system, you'll start to see the light dim at the far end of the strip after about 30-65 feet. By stepping up to a 36V or 48V system (with matching 36V or 48V strips), you can push that power much further down the line with less visible dimming. This is key for large architectural coves or long hallway accents where you want to minimize the number of power supplies and wiring.

No, and this is a critical safety point. These enclosed power supplies need air to stay cool—that's why the case is perforated. Sealing one inside a wall or ceiling without ventilation is a fire hazard. It will overheat and either shut down constantly or fail completely. They must be installed in a location with free air movement, like a utility closet, a large cabinet, or a purpose-built electronics enclosure.

It comes down to noise and cooling capacity. Fanless models, like the MeanWell UHP series, use convection and are completely silent. That's what you want for homes, offices, or studios. Models with a fan, like the LRS or RSP series, can handle more power in a smaller space, but the fan makes some noise. For industrial applications or places where noise doesn't matter, a fan-cooled unit is a cost-effective choice.

Yes, we do this all the time. A large part of our business is building solutions to fit a customer's specific drawing. Just send us your requirements—output voltage, wattage, the exact wire lengths you need for both the AC input and DC output, and the type of connector you want. Our engineers will spec the right MeanWell model and prepare a quote for the custom wiring harness, usually within 12 hours. There's no fee for the consultation and no obligation to order.